Struct chalk_ir::DynTy [−][src]
pub struct DynTy<I: Interner> { pub bounds: Binders<QuantifiedWhereClauses<I>>, pub lifetime: Lifetime<I>, }
Expand description
A “DynTy” represents a trait object (dyn Trait
). Trait objects
are conceptually very related to an “existential type” of the form
exists<T> { T: Trait }
(another example of such type is impl Trait
).
DynTy
represents the bounds on that type.
The “bounds” here represents the unknown self type. So, a type like
dyn for<'a> Fn(&'a u32)
would be represented with two-levels of
binder, as “depicted” here:
exists<type> {
vec![
// A QuantifiedWhereClause:
forall<region> { ^1.0: Fn(&^0.0 u32) }
]
}
The outer exists<type>
binder indicates that there exists
some type that meets the criteria within, but that type is not
known. It is referenced within the type using ^1.0
, indicating
a bound type with debruijn index 1 (i.e., skipping through one
level of binder).
Fields
bounds: Binders<QuantifiedWhereClauses<I>>
The unknown self type.
lifetime: Lifetime<I>
Lifetime of the DynTy
.
Trait Implementations
The type of value that will be produced once folding is done.
Typically this is Self
, unless Self
contains borrowed
values, in which case owned values are produced (for example,
one can fold over a &T
value where T: Fold
, in which case
you get back a T
, not a &T
). Read more
Apply the given folder folder
to self
; binders
is the
number of binders that are in scope when beginning the
folder. Typically binders
starts as 0, but is adjusted when
we encounter Binders<T>
in the IR or other similar
constructs. Read more
type Interner = I
type Interner = I
The interner associated with the type.
fn visit_with<'i, B>(
&self,
visitor: &mut dyn Visitor<'i, I, BreakTy = B>,
outer_binder: DebruijnIndex
) -> ControlFlow<B> where
I: 'i,
[src]
fn visit_with<'i, B>(
&self,
visitor: &mut dyn Visitor<'i, I, BreakTy = B>,
outer_binder: DebruijnIndex
) -> ControlFlow<B> where
I: 'i,
[src]Apply the given visitor visitor
to self
; binders
is the
number of binders that are in scope when beginning the
visitor. Typically binders
starts as 0, but is adjusted when
we encounter Binders<T>
in the IR or other similar
constructs. Read more
impl<I: Interner> Copy for DynTy<I> where
I::InternedLifetime: Copy,
I::InternedQuantifiedWhereClauses: Copy,
I::InternedVariableKinds: Copy,
[src]Auto Trait Implementations
impl<I> RefUnwindSafe for DynTy<I> where
<I as Interner>::InternedLifetime: RefUnwindSafe,
<I as Interner>::InternedQuantifiedWhereClauses: RefUnwindSafe,
<I as Interner>::InternedVariableKinds: RefUnwindSafe,
impl<I> Send for DynTy<I> where
<I as Interner>::InternedLifetime: Send,
<I as Interner>::InternedQuantifiedWhereClauses: Send,
<I as Interner>::InternedVariableKinds: Send,
impl<I> Sync for DynTy<I> where
<I as Interner>::InternedLifetime: Sync,
<I as Interner>::InternedQuantifiedWhereClauses: Sync,
<I as Interner>::InternedVariableKinds: Sync,
impl<I> Unpin for DynTy<I> where
<I as Interner>::InternedLifetime: Unpin,
<I as Interner>::InternedQuantifiedWhereClauses: Unpin,
<I as Interner>::InternedVariableKinds: Unpin,
impl<I> UnwindSafe for DynTy<I> where
<I as Interner>::InternedLifetime: UnwindSafe,
<I as Interner>::InternedQuantifiedWhereClauses: UnwindSafe,
<I as Interner>::InternedVariableKinds: UnwindSafe,
Blanket Implementations
Mutably borrows from an owned value. Read more
Cast a value to type U
using CastTo
.
impl<T, I> CouldMatch<T> for T where
T: Zip<I> + HasInterner<Interner = I> + ?Sized,
I: Interner,
[src]
impl<T, I> CouldMatch<T> for T where
T: Zip<I> + HasInterner<Interner = I> + ?Sized,
I: Interner,
[src]Checks whether self
and other
could possibly match.
Shifts this term in one level of binders.
Shifts a term valid at outer_binder
so that it is
valid at the innermost binder. See DebruijnIndex::shifted_in_from
for a detailed explanation. Read more
Shifts a term valid at the innermost binder so that it is
valid at outer_binder
. See DebruijnIndex::shifted_out_to
for a detailed explanation. Read more
Shifts this term out one level of binders.